<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	<script type="text/javascript">
		
//		alert(history.length);
		setTimeout(function(){
//			返回上一个访问记录
//			history.back();
			
			history.go(-1);
			
		},3000)
		
	</script>
	</head>
	<body>
		
		<h1>这里是4.html</h1>
		
	</body>
</html>
